With FIX 4 I got the result 1.9999 in less than 3 min. Using it with EQN editor I get 2 immediatly, but with std setting in 'number format' mode no luck after a few minutes.

(11-27-2017 01:33 AM)Carsen Wrote: Good evening (at least where I live) Thanks a lot! also your contribute is important for me. Okay, Dieter was fast as flash, but I can't delete my post. Try your little program LBL1 without step 03 and 05 (both ENTER). Higher settings may cause very long integration times, especially on a hardware 15C. It's always a good idea to start with a moderate display setting like SCIВ 2 or FIXВ 2 or maybe FIXВ 4. The AFH shows how such cases can be handled. As x approaches 1 the function approaches infinity. Take a look at the graph near x=1 and you'll see why this integrand is not trivial and why you should not expect a plain 2. Quote:Answers to both questions can be found in the 15C Advanced Functions Handbook which explains the Integrate function in detail. However not in hardware: this is strange by me: FIX 4 and nothing happens after 27 min, also with SCI 4. Quote:Set FIXВ 4, and the official HP emulator returns 1,9999 almost immediately.ДЇIXВ 6 already causes the emulator to run for a while. I thought there was something wrong in Reg but it seems not. Remember, this setting directly influences the accuracy of the result вЂ“ and thus the execution time. I controlled that all was ok with ON/y^x procedure (all flags and -88.88.88.88.88), I reset also the continuous memory (ON/-) but the same with FIX 4, with FIX 2 I get 1.99 after about 3 mins In hardware HP15C no result after 27 min now with your program. Without the ENTER I get 1.9999 in iOS in about 2 min (1 min with SCI 4). (11-26-2017 11:01 PM)Dieter Wrote: What are the two ENTERs supposed to do? I would say I am a solid user of the machine. But I hope my input on how I solved the integral on my calculators (and my Dad's) proved useful. I can't give any advice as I am not a proficient user of the HP-15C ONLY because I don't own one yet. In a time of 16 minutes and 28 seconds, I stopped the 15C and didn't get an answer as a result. Then I set the 15C to a fix of 4 and attempted to integrate the integral again. In a time of 2 minutes and 42 seconds, I got the answer of 1.99. I set the HP-15C to a fix of 2 and integrated the integral from 0 to 1. Next I tested your integral on my Dad's (hardware 1987) HP-15C. I used the integral function that is on the key and I built the equation on the stack with RPN. I did not use the Equation Writer and I was in RPN mode. mode on the HP 50g with a fix of 4, I get 1.9999 in a matter of 3 to 4 minutes. In exact mode, I receive the answer of 2 immediately. I tested your integral on my (hardware) HP 50g.

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